VALENCIA – When it comes to the top high school softball teams in Southern California, Valencia often is without peer. The Vikings perennially are one of the nation’s premier programs.

West Ranch was well aware of the rather lofty reputation Valencia possesses heading into Thursday’s Foothill League game. The Wildcats were significant underdogs, especially after a seven-run loss Tuesday to Saugus.

But thanks to the sister combination of Janelle and Lauren Lindvall, who delivered a pair of dramatic home runs, the visiting Wildcats rallied for a 7-6 upset that snapped the Vikings’ 15-game league winning streak.

“I don’t know what to say, I’m speechless. This a huge win for us, the biggest in the history of our program,” West Ranch coach Bob Shults said. “Valencia showed a lot of class, and make no mistake, they are still the team to beat around here. But for us, this is a step in the right direction. What an incredible victory.”

Starter Carly Mortensen was pulled from the game for Valencia (15-2, 1-1) in the sixth inning with what appeared to be an injured right arm. Without the junior around, the Wildcats (13-5, 1-1) rallied.

West Ranch’s Kylie Sorenson homered off Nicole Miller to tie it 7-7 in the seventh.

Lauren Lindvall then stepped to the plate and, with two outs and two strikes, the freshman hit a home run to give the Wildcats a one-run lead heading into the bottom half of the seventh inning.

“The only thing I was thinking about was making contact,” Lauren Lindvall said. “I knew that I connected with the sweet spot of the bat, but didn’t look up to see where the ball went. I had a really good feeling, and when I heard my teammates yelling and screaming I figured out that the ball went over the fence.”

Bailey Foster took over from there. West Ranch’s junior left-hander retired Valencia in the bottom half of the inning and finished with nine strikeouts.

“When Carly went out of the game, I knew it was going to be tough. We didn’t want to risk further injury, though,” Valencia coach Donna Lee said. “This was a difficult loss, yes. Are we worried? No, we’re not. It’s a long season and the good thing is we still control our own destiny. That’s most important.”

West Ranch trailed 3-0 in the top of the fifth inning. Sorenson came up with a two-run single and Janelle Lindvall capped the rally with a three-run homer to give the Wildcats a 5-3 lead.

“I was looking for a good pitch to hit, and thankfully got a good one,” Lindvall said. “We went into the game knowing we had a chance.

“Being intimidated wasn’t going to help us out.”

Valencia entered the game as the top-ranked team in the state and No.4 in the country by National Fastpitch Coaches Association/USA Today.

Matters certainly were not helped by the fact the Wildcats were in the midst of a three-game losing streak and had not defeated the Vikings in eight previous games, during which they scored a combined four runs.

“We put it all together out there today and this win gives us a lot of confidence,” Shults said.